Help Me Again?

I was thinking of getting a crowntail betta. But I heard they were prone to fin rot, and fin curling. I was wondering why, and if kept in a clean environment (2.6g Fluval Spec III) will these problems go away?

2.5 are super hard to keep stable. However if you have a larger tank, the crown tail will likely do better in it. Having the rays rather than the halfmoon allows greater maneuverability and decreased drag. I have one in a 29 gallon. He loves it!